ZD30 diesel reserve tank won't shut off when empty.

[Steve SA]

My diesel reserve tank won't shut off when empty. Car is a 2003 ZD30 Patrol. Reserve tank keeps trying to pump diesel even though empty. Any thoughts. Steve.

[the evil twin]

Is your Sub tank fuel qty Gauge accurate?

[Steve SA]

Is your Sub tank fuel qty Gauge accurate?

Hi,yes I check it when I fill it up that it takes 30 litres

[the evil twin]

Hi,yes I check it when I fill it up that it takes 30 litres

Hmmm, interesting

The sub tank poota monitors the sub tank qty and should switch off the pump when it thinks the tank is empty
If the gauge is working OK then I would assume the sender and wiring is OK and suspect the "Sub Tank Control Unit".

But before any of that have you added any extra earth straps from the chassis to the body etc?
Patrols are notorious for earthing gremlins esp the Sub Tank System and an "extra" earth strap from the vicinity of the sub tank pump to the body will often get rid of weird faults maybe 75% of the time

[Steve SA]

Hmmm, interesting

The sub tank poota monitors the sub tank qty and should switch off the pump when it thinks the tank is empty
If the gauge is working OK then I would assume the sender and wiring is OK and suspect the "Sub Tank Control Unit".

But before any of that have you added any extra earth straps from the chassis to the body etc?
Patrols are notorious for earthing gremlins esp the Sub Tank System and an "extra" earth strap from the vicinity of the sub tank pump to the body will often get rid of weird faults maybe 75% of the time

Thanks for that I'll try an earth strap and see if it helps. Steve.

[pollenface]

can't you just turn it off manually?